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Papers by Vítor Antunes

Sustainability

This paper addresses the changes in bitumen properties during multi-recycling cycles, both before... more This paper addresses the changes in bitumen properties during multi-recycling cycles, both before and after ageing. The rheology of recovered bitumen was characterized using the dynamic shear rheometer. The softening point and penetration value were also determined. The analysis showed that the bitumen’s properties could be recovered even after more than one recycling cycle. The bitumen recovered from the second recycling cycle presented an average reduction of 45% in terms of complex modulus when compared with the first recycling cycle. The bitumen from the RAP mixtures presented a similar susceptibility to ageing. The analysis clearly showed that RAP has the potential to be multi-recycled.

Recycling, 2020

The demand for more sustainable solutions has led an ever-growing number of stakeholders to being... more The demand for more sustainable solutions has led an ever-growing number of stakeholders to being committed to pursue the principles of sustainability in pavement management. Different stakeholders have been looking for tools and methodologies to evaluate the environmental impacts of the solutions, for which the life cycle assessment (LCA) proved to be an appropriate methodology. This paper is focused on the LCA of road pavement multi-recycling based on the use of bituminous mixtures with high rates of reclaimed asphalt pavement (RAP). In order to promote the circular economy, a comparative analysis was performed on a road pavement section by taking into account different scenarios, which stem from the combination of production, construction and rehabilitation activities incorporating different RAP rates in new bituminous mixtures: 0% (as reference), 25%, 50%, 75% and 100%, respectively. LCA results have been expressed in terms of four damage categories: human health, ecosystem qual...

Construction and Building Materials, 2015

h i g h l i g h t s Hydraulic and hydrated limes are composed of granulous-shaped particles. Ceme... more h i g h l i g h t s Hydraulic and hydrated limes are composed of granulous-shaped particles. Cement and natural filler particles are mostly angular with smooth to rough surfaces. The Rigden voids of hydrated lime are much larger than those of the other fillers. The RV, the PA and the DT R&B test results show a strong interrelation. It is proposed the inclusion of the f/b max ratio in filler specifications.

Transportation Infrastructure Geotechnology, 2017

Recycling

Considerable amounts of Reclaimed Asphalt Pavement (RAP) are produced every year, as the road net... more Considerable amounts of Reclaimed Asphalt Pavement (RAP) are produced every year, as the road network requires maintenance to ensure the safety and comfort of its users. RAP is a 100% recyclable material and a useful fit to be re-introduced into another cycle without downgrading its functionality. Despite the current knowledge about the benefits associated with RAP use, it is not yet largely applied in several countries. This paper aims to validate, on the basis of both short- and long-term mechanical behaviours, the application of a bituminous mixture with a high RAP incorporation rate (75%) in road pavement wearing courses. A crude tall oil rejuvenator was used. Both short- and long-term oven ageing procedures were employed to simulate the ageing that occurs during mixture production and in-service life, respectively. The tests for validating the RAP mixture as an alternative solution comprised stiffness, resistance to fatigue, permanent deformation, and determination of the water...

Sumário Algumas empresas do setor da construção que integram a Plataforma Tecnológica Portuguesa ... more Sumário Algumas empresas do setor da construção que integram a Plataforma Tecnológica Portuguesa da Construção (PTPC) decidiram promover a cooperação tecnológica entre si e com as entidades do Sistema Científico e Tecnológico Nacional (SCTN) para o desenvolvimento de novas soluções de pavimentação rodoviária para aplicação em países de clima tropical, nomeadamente ao nível das misturas betuminosas e das camadas de solocimento. O objetivo do projeto foi permitir a eventual criação de uma solução de pavimentação inovadora através do desenvolvimento de uma mistura betuminosa e de uma mistura de solo-cimento formuladas com base em ensaios empíricos e de desempenho, à escala laboratorial e, posteriormente, validando esse desempenho num ensaio à escala real recorrendo a uma Pista de Ensaios Acelerados de Pavimentos, onde foram aplicados carregamentos idênticos às solicitações que serão alvo ao longo do seu período de vida útil. Esta Pista de Ensaios Acelerados de Pavimentos construída no ...

Sustainability

This paper addresses the changes in bitumen properties during multi-recycling cycles, both before... more This paper addresses the changes in bitumen properties during multi-recycling cycles, both before and after ageing. The rheology of recovered bitumen was characterized using the dynamic shear rheometer. The softening point and penetration value were also determined. The analysis showed that the bitumen’s properties could be recovered even after more than one recycling cycle. The bitumen recovered from the second recycling cycle presented an average reduction of 45% in terms of complex modulus when compared with the first recycling cycle. The bitumen from the RAP mixtures presented a similar susceptibility to ageing. The analysis clearly showed that RAP has the potential to be multi-recycled.

Recycling, 2020

The demand for more sustainable solutions has led an ever-growing number of stakeholders to being... more The demand for more sustainable solutions has led an ever-growing number of stakeholders to being committed to pursue the principles of sustainability in pavement management. Different stakeholders have been looking for tools and methodologies to evaluate the environmental impacts of the solutions, for which the life cycle assessment (LCA) proved to be an appropriate methodology. This paper is focused on the LCA of road pavement multi-recycling based on the use of bituminous mixtures with high rates of reclaimed asphalt pavement (RAP). In order to promote the circular economy, a comparative analysis was performed on a road pavement section by taking into account different scenarios, which stem from the combination of production, construction and rehabilitation activities incorporating different RAP rates in new bituminous mixtures: 0% (as reference), 25%, 50%, 75% and 100%, respectively. LCA results have been expressed in terms of four damage categories: human health, ecosystem qual...

Construction and Building Materials, 2015

h i g h l i g h t s Hydraulic and hydrated limes are composed of granulous-shaped particles. Ceme... more h i g h l i g h t s Hydraulic and hydrated limes are composed of granulous-shaped particles. Cement and natural filler particles are mostly angular with smooth to rough surfaces. The Rigden voids of hydrated lime are much larger than those of the other fillers. The RV, the PA and the DT R&B test results show a strong interrelation. It is proposed the inclusion of the f/b max ratio in filler specifications.

Transportation Infrastructure Geotechnology, 2017

Recycling

Considerable amounts of Reclaimed Asphalt Pavement (RAP) are produced every year, as the road net... more Considerable amounts of Reclaimed Asphalt Pavement (RAP) are produced every year, as the road network requires maintenance to ensure the safety and comfort of its users. RAP is a 100% recyclable material and a useful fit to be re-introduced into another cycle without downgrading its functionality. Despite the current knowledge about the benefits associated with RAP use, it is not yet largely applied in several countries. This paper aims to validate, on the basis of both short- and long-term mechanical behaviours, the application of a bituminous mixture with a high RAP incorporation rate (75%) in road pavement wearing courses. A crude tall oil rejuvenator was used. Both short- and long-term oven ageing procedures were employed to simulate the ageing that occurs during mixture production and in-service life, respectively. The tests for validating the RAP mixture as an alternative solution comprised stiffness, resistance to fatigue, permanent deformation, and determination of the water...

Sumário Algumas empresas do setor da construção que integram a Plataforma Tecnológica Portuguesa ... more Sumário Algumas empresas do setor da construção que integram a Plataforma Tecnológica Portuguesa da Construção (PTPC) decidiram promover a cooperação tecnológica entre si e com as entidades do Sistema Científico e Tecnológico Nacional (SCTN) para o desenvolvimento de novas soluções de pavimentação rodoviária para aplicação em países de clima tropical, nomeadamente ao nível das misturas betuminosas e das camadas de solocimento. O objetivo do projeto foi permitir a eventual criação de uma solução de pavimentação inovadora através do desenvolvimento de uma mistura betuminosa e de uma mistura de solo-cimento formuladas com base em ensaios empíricos e de desempenho, à escala laboratorial e, posteriormente, validando esse desempenho num ensaio à escala real recorrendo a uma Pista de Ensaios Acelerados de Pavimentos, onde foram aplicados carregamentos idênticos às solicitações que serão alvo ao longo do seu período de vida útil. Esta Pista de Ensaios Acelerados de Pavimentos construída no ...

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